The rivers which have been linked via the Cumberland road since 1818 are the Potomac and Ohio rivers.
The National Road, also known as the Cumberland Road, was the first major advanced toll road constructed by the federal government in the United States.
Built between 1811 and 1837, the 620-mile (1,000 km) avenue linked the Potomac and Ohio Rivers and became a major delivery route to the West for hundreds of settlers.
Construction started heading west in 1811 at Cumberland, Maryland, on the Potomac River.
Therefore, from the above announcement, it's clear that the Potomac and Ohio rivers are the right answers.
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